Gridbag Layout，Insets或anchor不会生效

Question

好的，所以我需要你的帮助。我不知道我错过了什么，但即使我已经将布局设置为GridBag，插图和锚也没有生效。

我需要将退出按钮放在tabbedpane上方，并将注销按钮放在右上角。换句话说，位置gridx上的选项卡式窗格= 0，gridy = 1;和logout位置上的按钮gridx = 0，gridy = 0;

此外，主页面板内的myaccount按钮，leftpanel和rightpanel不会获得我应用的插图。

我错过了什么。请帮忙，因为我对此布局不熟悉。

TopPanel.java

package HomeTab;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.border.Border;

public class HomeTopPanel extends JPanel {

private final JButton MyAccountButton = new JButton("My Account");
private final JPanel leftPanel = new JPanel(new GridBagLayout());
private final JPanel rightPanel = new JPanel(new GridBagLayout());
private final Border leftPanelLineBorder =   BorderFactory.createLineBorder(Color.BLACK, 2);
private final Border rightPanelLineBorder = BorderFactory.createLineBorder(Color.BLACK, 2);

//CONSTRUCTOR
public HomeTopPanel(){
    constructMyAccountButton();
    constructPanels();
    setLeftRightPanelBorders();
    this.setLayout(new GridBagLayout());
}

private void constructMyAccountButton(){
    GridBagConstraints MyAccountButton_gbc = new GridBagConstraints();
    MyAccountButton_gbc.gridx = 0; MyAccountButton_gbc.gridy = 0; 
    MyAccountButton_gbc.anchor = GridBagConstraints.NORTHWEST;
    this.add(MyAccountButton);
}

private void constructPanels(){
    GridBagConstraints leftPanelgbc = new GridBagConstraints();
    GridBagConstraints rightPanelgbc = new GridBagConstraints();

    leftPanelgbc.insets = new Insets(3,3,3,3);
    leftPanelgbc.gridx = 1; leftPanelgbc.gridy = 0;
    leftPanel.setPreferredSize(new Dimension(300, 500));
    this.add(leftPanel);

    rightPanelgbc.insets = new Insets(3,3,3,3);
    rightPanelgbc.gridx = 2; leftPanelgbc.gridy = 0;
    rightPanel.setPreferredSize(new Dimension(300, 500));
    this.add(rightPanel);

}

private void setLeftRightPanelBorders(){
    leftPanel.setBorder(leftPanelLineBorder);
    rightPanel.setBorder(rightPanelLineBorder);
    this.setBorder(leftPanelLineBorder);
}
}

HomeTopPanel.java

private void constructPanels(){
    GridBagConstraints gbc2 = new GridBagConstraints();

    gbc2.gridx = 1; gbc2.gridy = 0; 
    gbc2.insets = new Insets(5, 5, 5, 5);
    leftPanel.setPreferredSize(new Dimension(250, 300));
        this.add(leftPanel,gbc2);

    gbc2.gridx = 2; gbc2.gridy = 0; 
    gbc2.insets = new Insets(5, 5, 5, 5);    
    rightPanel.setPreferredSize(new Dimension(300, 500));
        this.add(rightPanel,gbc2);

}

先谢谢了。我确定我错过了但我不知道的事情。

INSETS不会申请。 =（??

更新：

我使用以下代码添加了insets：

var casper = require('casper').create();
var url = 'https://itunesconnect.apple.com/itc/static/login?view=1&path=%2FWebObjects%2FiTunesConnect.woa%3F'

casper.on("page.error", function(msg, trace) {
  this.echo("Error:    " + msg, "ERROR");
  this.echo("file:     " + trace[0].file, "WARNING");
  this.echo("line:     " + trace[0].line, "WARNING");
  this.echo("function: " + trace[0]["function"], "WARNING");
  errors.push(msg);
});



casper.start(url, function(){
    casper.wait(7000, function(){
        // casper.echo(casper.getHTML());
    })
})

casper.run(function() {
  if (errors.length > 0) {
    this.echo(errors.length + ' Javascript errors found', "WARNING");
  } else {
    this.echo(errors.length + ' Javascript errors found', "INFO");
  }
  casper.exit();
});

但仍然没有得到5的任何插图。

Answer 1

添加组件时应用约束

add(topTabbedPane, gbc);

Answer 2

GridBagConstraints MyAccountButton_gbc = new GridBagConstraints();

变量名称不应以大写字符开头。你的大多数其他名字都是正确的。然后没有理由邋..遵循Java惯例。

constructMyAccountButton();
constructPanels();
setLeftRightPanelBorders();
this.setLayout(new GridBagLayout());

必须在将组件添加到面板之前设置布局。

GridBagConstraints MyAccountButton_gbc = new GridBagConstraints();
MyAccountButton_gbc.gridx = 0; MyAccountButton_gbc.gridy = 0; 
MyAccountButton_gbc.anchor = GridBagConstraints.NORTHWEST;
//this.add(MyAccountButton); // where is the constraint?
this.add(MyAccountButton, myAccountButton_gbc);

您实际上必须使用约束。